Update readme

README.md

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 # TweakXL
+
+TweakXL is a modding tool that allows you to modify TweakDB.
+
+## Getting Started
+
+### Prerequisites
+
+- [RED4ext](https://docs.red4ext.com/getting-started/installing-red4ext) 1.4.0+
+
+### Installation
+
+1. Download [the latest release](https://github.com/psiberx/cp2077-tweak-xl/releases) archive
+2. Extract the archive into the Cyberpunk 2077 installation directory
+
+## Documentation
+
+- [About TweakDB](/psiberx/cp2077-tweak-xl/wiki/About-TweakDB)
+- [YAML Tweaks](/psiberx/cp2077-tweak-xl/wiki/YAML-Tweaks)
+- [Script Extensions](/psiberx/cp2077-tweak-xl/wiki/Script-Extensions)
+- [Modder Tools](/psiberx/cp2077-tweak-xl/wiki/Modder-Tools)
+- [Examples](/psiberx/cp2077-tweak-xl/wiki/Examples)